diff --git a/lib/OpenLayers/Control/PanZoomBar.js b/lib/OpenLayers/Control/PanZoomBar.js
index babb1a6792..6d20b3459d 100644
--- a/lib/OpenLayers/Control/PanZoomBar.js
+++ b/lib/OpenLayers/Control/PanZoomBar.js
@@ -91,7 +91,7 @@ OpenLayers.Control.PanZoomBar.prototype =
     },
     divClick: function (evt) {
         var y = evt.xy.y;
-        var top = parseInt(this.slider.top);
+        var top = Position.page(evt.object)[1];
         var levels = Math.floor((y - top)/this.zoomStopHeight);
         this.map.zoomTo(this.map.getZoomLevels() - levels);
         Event.stop(evt);